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Introduction
This Special Instruction is intended to provide information on the Engine Overhaul Kit Consist and detailed information on specific parts that should be used based on engine arrangements.This Engine Overhaul Kit may contain extra parts and extra quantities due to the variety of engine arrangements assigned to a given kit. Refer to the corresponding Parts Manual or Disassembly and Assembly manual in Table 1.Note: This Kit may contain upgraded parts. These upgraded part numbers may be different than what you have in the parts manual or engine, but these parts have been technically reviewed for compatibility with your application. Note: This kit contains gasket kits and includes additional parts needed to perform an engine overhaul.Note: For assistance with technical questions, contact your local Cat dealer. Note: For more information, visit us at catmarinesupport.com.Note: For access to our website, you can scan the QR code below with a QR enabled device.
Illustration 1 g03335467
Reference Material
Table 1
Engine Model     Engine Arrangement     Engine Serial Number Range     Parts Book Media     Disassembly and Assembly Media    
3412     9Y-1476     S/N:81Z05000-14500     SEBP2465     SENR2565    
3412C     9Y-1476     S/N:81Z14501-UP     SEBP2576    Note: For ordering reference material contact your local Cat dealer.3412 and 3412C 428-8745 Top End Overhaul Kit Consist
Table 2
428-8745 Top End Overhaul Kit Consist    
Gasket Kits    
Part Number     Part Name     Qty    
219-6544     After Cooler and Lines Gasket Kit     1    
419-8601     Single Cylinder Head Gasket Kit     2    
419-9849     Fuel System Gasket Kit     1    
420-8545     Oil Cooler and Lines Gasket Kit     1    
Additional Parts Included in This Kit    
Part Number     Part Name     Qty    
1R-0749     Fuel Filter     2    
1R-1808     Engine Oil Filter     2    
2N-2766     Locknut     24    
3D-2824     O-Ring Seal     1    
4H-9541     Gasket     1    
4L-8337     O-Ring Seal     2    
5S-1188     O-Ring Seal     2    
6L-8562     Taperlock Stud     4    
8M-2296     Full Nut     4    
106-1792     Taperlock Stud     24    
245-8342     Gasket     1    
248-5513     Temperature Regulator     2    
305-6843     Guide Spring     24    Note: For assistance or technical questions contact your local Cat dealer.Note: Refer to Illustration 2 for location of gasket kits.3412C Engine Gasket Kit Locations
Illustration 2 g03377496
(1) Aftercooler and Lines ( 219-6544 Gasket Kit ) (2) Single Cylinder Head ( 419-8601 Gasket Kit ) (3) Fuel System ( 419-9849 Gasket Kit ) (4) Oil Cooler and Lines ( 420-8545 Gasket Kit )Gasket Kit Consists
Aftercooler and Lines (219-6544 Gasket Kit)
Table 3
219-6544 Gasket Kit (Aftercooler and Lines)    
Part Number     Part Name     Qty    
3J-7354     O-Ring Seal     1    
4N-2564     Gasket     1    
4N-4307     Gasket     1    
4N-8628     Gasket     1    
7C-0307     Gasket     1    
109-0076     O-Ring Seal     6    
112-3258     O-Ring Seal     3    
112-3259     O-Ring Seal     2    
112-8186     O-Ring Seal     2    
118-7214     O-Ring Seal     1    
245-8342     Gasket     2    Refer to Illustration 2.Single Cylinder Head (419-8601 Gasket Kit)